AAAA's for www.netflix.com

Fri Jun 8 02:23:33 UTC 2012

On Fri, Jun 08, 2012 at 12:11:20PM +1000, Mark Andrews wrote:
> > $ dig @pdns3.ultradns.org www.netflix.com. A +norec +short
> > wwwservice--frontend-313423742.us-east-1.elb.amazonaws.com.
> > $ dig @pdns3.ultradns.org www.netflix.com. AAAA +norec +short
> > dualstack.wwwservice--frontend-313423742.us-east-1.elb.amazonaws.com.
> > $ dig @pdns3.ultradns.org www.netflix.com. ANY +short +norec
> > $
> > 
> > Resolving www.netflix.com using ANY RRtype fails with an empty answer
> > section in the DNS response.
> 
> Which is just plain BROKEN.

Yup.

> > This DNS trickery seems to be from the "taking a shower, trying not
> > to get wet" department. And has adverse effects in corner cases. While
> > playing around, I had periods of time where I couldn't resolve the FQDN
> > at all, possibly due some caching of the empty response.
> 
> It's not DNS trickery.

The "trickery" is returning different CNAMEs for QTYPE=A and QTYPE=AAAA.
I'm not sure what's the goal of that is, but it's 4am here so I have an
excuse of not seeing the light. :)

Best regards,
Daniel

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